package com.qk.interceptor;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //获取请求路径
        String uri = request.getRequestURI();
        //判断是否为登录请求 ,如果是, 放行
        if (uri.contains("/login")){
            log.info("登录请求: {}", uri);
            return true;
        }
        //如果不是则获取请求头中的token
        String jwt = request.getHeader("token");
        //判断是否有token, 如果没有, 响应401错误
        if (jwt == null || jwt.isEmpty()){
            log.info("请求头中没有token");
            response.setStatus(401);
            return false;
        }
        //如果有, 解析token, 若解析失败则响应401错误
        try{
            Claims claims = JwtUtils.parseToken(jwt);
            Integer id = claims.get("id", Integer.class);
            log.info("当前用户id: {}", id);
            CurrentUserHoler.setCurrentUser(id);
        }
        catch (Exception e){
            log.info("解析token失败");
            response.setStatus(401);
            return false;
        }
        //若解析成功则放行
        log.info("登陆成功,放行");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("删除TreadLocal中的登录信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
